L and T dwarfs in the Hyades and Ursa Major moving groups

TL;DR

This study identifies L and T dwarfs in the Ursa Major and Hyades moving groups, establishing empirical isochrones at 400 and 625 million years, respectively, and discusses the implications for stellar age estimation.

Contribution

The paper reports the discovery of L and T dwarfs in two moving groups, providing new empirical isochrones for these ages and highlighting the complexities of group membership and coevality.

Findings

Identified 3 L and 1 T dwarfs in Ursa Major group.

Found 5 L and 2 T dwarfs in Hyades group.

Established empirical isochrones at 400 and 625 Myr.

Abstract

We have used the moving cluster method to identify three L dwarfs and one T dwarf in the Ursa Major/Sirius moving group (age 400 Myr). Five L dwarfs and two T dwarfs are found to belong to the Hyades moving group (age 625 Myr). These L and T dwarfs define 400- and 625- Myr empirical isochrones, assuming that they have the same age. Moving group membership does not guarantee coevality.